errno

I have a program that consists of a master server and distributed slave servers. The slave servers send status updates to the server, and if the server hasn't heard from a specific slave in a fixed period, it marks the slave as down. This is happening consistently. From inspecting logs, I have found that the slave is only able to send one status update to the server, and then is never able to send another update, always failing on the call to connect() "Cannot assign requested address (99). Oddly enough, the slave is able to send several other updates to the server, and all of the connections

Socket 类 Socket的定义和实现分别在文件Socket.hpp和 Socket.cpp中。它的主要功能是 封装了socket文件描述符、此socket对应的端口号，以及socket接口中的listen, accept, connect和close等函数 ，为用户提供了一个简单易用而又统一的接口。同时 作为其他派生类的基类。 Socket类的定义如下： #ifndef SOCKET_H #define SOCKET_H #include "headers.h" #include "SocketAddr.hpp" /* ------------------------------------------------------------------- */ class Socket { public: // stores server port and TCP/UDP mode Socket( unsigned short inPort, bool inUDP = false ); // destructor virtual ~Socket(); protected: // get local address SocketAddr getLocalAddress( void ); // get remote address SocketAddr

Failed to start iptables.service: Unit iptables.service failed to load: No such file or directory. 错误貌似因为没有安装 iptables-services. 使用 yum install iptables-services 报错 xxxxx [Errno 256] No more mirrors to try. 查了下执行以下命令 1: yum clean all 完成 2: yum makecache 出现以下错误: [Errno 14] curl#37 - "Couldn't open file /mnt/repodata/repomd.xml 因为这个错误, 查了将近两个小时各种方法无解, 最后仔细看错误信息发现. 请求的路径是 /mnt/repodata/repomd.xml. 而我的redhat系统盘挂载的路径是 /mnt/cdrom/repodata/ 有可能是之前修改了fstab. 报错时候的fstab文件信息. 使用命令 vim /etc/fstab 修改fstab文件 inster 键插入模式, 修改完成后 按 ESC 后, 输入 :wq 保存 修改后的fstab文件: 修改fstab文件后, 执行 umount -a 解除挂载 , 执行 mount -a 重新挂载

【转自https://www.cnblogs.com/Owen-ET/】 1 if __name__ == '__main__': 2 startime = time.strftime('%H:%M:%S') 3 print("开始时间为：%s" % startime) 4 #测试路径 5 test_dir = './t/test_case' 6 #报告路径 7 report_dir = './t/report/' 8 9 now = time.strftime('%Y-%m-%d_%H:%M:%S') 10 # 创建完整报告文件 11 filename = report_dir + now + '_report.html' 12 fp = open(filename,'wb') 看到没有！！看第九行，now的获取时间有问题！！！时分秒之间不能用冒号：,不能用冒号：,不能用冒号：，重要的事情说三遍！！！ 修改如下： 1 if __name__ == '__main__': 2 startime = time.strftime('%H:%M:%S') 3 print("开始时间为：%s" % startime) 4 #测试路径 5 test_dir = './t/test_case' 6 #报告路径 7 report_dir = './t/report/' 8 9 now =

我在安装dva时报错，报错如下 后来查阅方法后，试了一下删除npm,npm-cache的方法，结果无效，后来又看了一下 https://www.jb51.net/article/126221.htm l的文章，然后就好了 方法： 在要安装dva的文件夹内运行命令 npm config set registry https://registry.npm.taobao.org cnpm install dva-cli -g 然后成功 来源： https://www.cnblogs.com/ellen-mylife/p/11334395.html

In my Python socket program, I sometimes need to interrupt it with Ctrl-C . When I do this, it does close the connection using socket.close() . However, when I try to reopen it I have to wait what seems like a minute before I can connect again. How does one correctly close a socket? Or is this intended? Bartosz Yes, it is intended. Here you can read detailed explanation . It is possible to override this behavior by setting SO_REUSEADDR option on a socket. For example: sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) ayoub laaziz $ ps -fA | grep python 501 81211 12368 0 10:11PM

#include <stdlib.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <signal.h> #include <ctype.h> #include <time.h> #include <sys/types.h> #include <sys/wait.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netinet/in.h> #include <netdb.h> #include <unistd.h> #include <fcntl.h> #include <sys/time.h> #define BACKLOG 5 #define LENGTH 512 void error(const char *msg) { perror(msg); exit(1); } int tcp_send(char *ip, int PORT, char *filename) { /* Variable Definition */ int sockfd; int nsockfd; char revbuf[LENGTH]; struct sockaddr_in remote_addr; /* Get the Socket file

添加自定义加密方法 CRC32.h #pragma once class CRC32 { public: CRC32(void); public: ~CRC32(void); static unsigned GetDataCRC32( const void*pData, unsigned dwSize, unsigned dwDefaultCRC ); }; CRC32.cpp #include "CRC32.h" //CRC表提取自zlib, crc32.h static const unsigned long CRCTable32[256] = { 0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL, 0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL, 0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL, 0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL, 0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL